nvidia driver crashes on login after fisrt install

I don't know more about this crash, sorry.

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/jockey-kde
InterpreterPath: /usr/bin/python2.6
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 002 Device 003: ID 413c:2003 Dell Computer Corp. Keyboard
 Bus 002 Device 002: ID 1267:0210 Logic3 / SpectraVideo plc
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Dell Inc Dimension C521
NonfreeKernelModules: nvidia
Package: jockey-kde 0.5-0ubuntu7
PackageArchitecture: all
ProcCmdLine: root=UUID=e24a458b-d71a-4b9c-95fc-1e4ec0335d75 ro quiet splash
ProcCmdline: /usr/bin/python /usr/bin/jockey-kde
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-11.38-generic
Signal: 11
SourcePackage: jockey
StacktraceTop:
 QWidget::metric () from /usr/lib/libQtGui.so.4
 QFont::QFont () from /usr/lib/libQtGui.so.4
 QWidgetPrivate::updateFont () from /usr/lib/libQtGui.so.4
 QWidgetPrivate::resolveFont () from /usr/lib/libQtGui.so.4
 QWidget::setParent () from /usr/lib/libQtGui.so.4
Title: jockey-kde crashed with SIGSEGV in QWidget::metric()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare